Hello!
When I got my meinl woodcrafts, the quinto was ringing, not the skin but the body. If i knocked the wood or hardware, the sound finished with that annoying ringy sound. All I did was puting/glued inside the drum pieces of foam and the ringiness stopped. One day foam was gone and Quinto was singing Quintish with no ringiness
Maybe body needs to break in like the skin?
Take care and Groove on!
P.